Design and characterisation of multi-mode interference reflector lasers for integrated photonics

Abstract

InAs quantum dot (QD) ridge waveguide (RWG) lasers comprising single-port multi-mode-interference-reflectors (MMIR) and single-cleaved reflectors are designed, fabricated, and characterized, to demonstrate capability for optoelectronic-integrated circuits. Simulations of an MMI- R show high values of fundamental mode reflectivity (> 80%) and good selectivity against higher-order modes. Deep-etched MMIR lasers fabricated with 0.5 mm long cavities have a threshold current of 24 mA, compared to 75 mA for standard cleaved-cleaved RWG lasers of the same length, both at 25 oC, and 56 mA compared to 102 mA at 55 oC. MMIR lasers exhibit stable ground state operation up to 50oC and show promise as small footprint sources for integrated photonics.

Monolithic InAs QDs based Active-Passive Integration for Photonic Integrated Circuits

“…Alternatively, postgrowth selective area intermixing offers the advantage of seamless integration and is a low loss coupling route for PICs without resorting to regrowth or heterogeneous integration methods. Recent work on the InAs quantum dots (QDs) laser establishes the viability and promises its use as a gain material for the implementation of PICs [4]. However, investigation on the selective area intermixing on InAs QDs based gain material for implementing PICs needs attention.…”